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Options 1 and 2 are easy to arrange. Option 3 is a non-starter; car agencies won't allow one-ways from Alaska to the lower 48 or v.v.

There are a number of cruise departures from Seward south to Vancouver BC in that time frame. (They can't cruise to Seattle because of legal restrictions.) Look at Expedia or some such for southbound sailing dates. Nine or ten days in Alaska followed by a cruise to Vancouver (then bus or train to Seattle) would be a great itinerary; look at www.cruisecritic.com for lost of advice.

Another option would be to fly from Anchorage to Skagway and then take the Alaska Ferry to Bellingham, WA. I think there is public transportation between Bellingham and Seattle. The ferry trip is 4 days and while a bit spartan, is a great way to travel. You could choose to spend more time in each port, the website gives a description of each.

I too would suggest a land tour, then cruise back to Vancouver, forget about 1/2 your time in Seattle, make the most of the costly location - Alaska, Seattle is easy to get cheap round trip flights for another trip. I would allow 8-10 days for interior. A necessary reference is THE MILEPOST, try your library. A usual trips allows a couple days at Denali park, Fairbanks, Anchorage, and perhaps overnight in Seward for day touring there. Consider a loop trip to Valdez and a ferry back to Whittier.